The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and outputsignals.

Diagnostic trouble codes (DTCs)

A diagnostic trouble code (DTC) is stored if the control module detects a fault. A fault which is detected in the most recent operating cycle is defined aspermanent. Other faults are defined as intermittent.The control module can store up to seven diagnostic trouble codes (DTCs).Should a fault disappear for any reason after being permanently stored in the control module as a diagnostic trouble code (DTC), the information remainsstored in the control module.If a fault is no longer permanent, the diagnostic trouble code (DTC) remains as intermittent.

Reading and erasing diagnostic trouble codes (DTCs)

Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.

Note! Certain functions are unavailable until the diagnostic trouble codes (DTCs) have been erased.

Reading off the control module identification

VIDA identifies control modules by reading off a number of codes from the control module memory.The codes contain information about the control module:

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hardware P/N (control module without software)

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hardware serial number (control module without software)

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software P/N

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diagnostic software P/N.

Reading off extended fault-tracing information

This function can be used to read parameters, status identifiers and counters stored at the same time as a diagnostic trouble code (DTC). These are calledfrozen values.For further information, see Description of vehicle communication information See: Testing and Inspection/Scan Tool Testing and Procedures/VehicleCommunication Information, Antenna Module (ATM)/Description of Vehicle Communication Information.

Reading off the parameters

Using this function, the status or value of parameters can be read off. The presentation of the status or value can be obtained graphically or digitally. Forfurther information about the different parameters, see Description of parameters See: Testing and Inspection/Scan Tool Testing and Procedures/VehicleCommunication Information, Antenna Module (ATM)/Description of Parameters.